Pop the popcorn according to your favorite method. Pour into a large bowl so you have room to toss with the butter.
Melt the butter, then let it cool slightly if it’s gotten too hot (some say that too much heat can degrade the truffle flavor). Mix in the truffle oil.
Toss the butter and oil mixture with the popcorn.
Add salt and toss again.
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Notes
If you don’t have truffle salt, use regular salt and increase the truffle oil by another ½ - 1 teaspoon.
I am not a health professional and nutrition data is calculated programatically. Accuracy may vary with product selection, calculator accuracy, etc. Consult a professional for the best information.